JP2986281B2 - Signal transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmission device, and more particularly to a signal transmission device for transmitting a signal between a rotating part and a fixed part.

[0002]

2. Description of the Related Art Conventionally, for transmitting signals between a rotating part and a fixed part, there is a method of transmitting and receiving signals using a transmitting antenna and a receiving antenna.

[0003]

However, this method has a problem in that accurate signal transmission is required, since it cannot be avoided that external noise is mixed in or becomes a noise source.

SUMMARY OF THE INVENTION An object of the present invention is to provide a signal transmission device having a simple structure which does not cause external noise in signal transmission between a rotating portion and a fixed portion, does not become a noise source to the outside, and can be easily manufactured. To provide.

[0005]

According to the present invention having the above object, a metal disk is formed on both surfaces of a resin disk, one surface is grounded, the other surface is an antenna surface, and the antenna surfaces face each other. Thus, transmission and reception of signals are performed.

Further, an insulating sheet is provided between the facing antenna surfaces.

[0007]

In the signal transmission device described above, a metal film is formed on both surfaces of a resin disk, one surface is grounded, and the other surface is an antenna surface. This pastes copper on both sides of the printed board, that is, the board made of glass epoxy resin,
Etching is performed to form a circular antenna portion. By forming in this manner, the antenna unit can be easily manufactured, and since the material is uniform by using glass epoxy resin, stable transmission and reception can be performed.

Further, by disposing an insulating sheet between the facing antenna surfaces, it is possible to prevent the antenna surfaces from contacting each other, and to secure electrical characteristics even if both antenna surfaces contact each other. .

[0009]

FIG. 1 is a diagram illustrating the principle of the present invention. In FIG. 1, a signal transmission device 100 has a pair of ring-shaped conductors 101 and 102, each of which has a lead drawn out, coaxially opposed to each other at a predetermined interval in a hollow electromagnetic shield 103. Further, one of the ring-shaped conductors is provided so as to be rotatable in the circumferential direction around the axis.

Next, the configuration of a rotary tube inspection machine using the signal transmission device according to the present invention will be described with reference to FIGS. 2, 3 and 4. The rotary tube inspection machine 2 includes a base 35, a motor 36, a rotating shaft 3
7, the rotation inspection table 12, the cam 46, the cam follower 4
7, holder elevating rotary shaft 48, centering jig 3
8, the in-tube inspection device 39, the camera selector 43
, A mixer 44, and an antenna unit 45 as a signal transmission device
, A rotary resolver 49, a fixed resolver 50, a light amount checker 51, and the like.

A fixed shaft (not shown) is provided on the base 35, and a tubular rotary shaft 37 is provided so as to share an axis with the fixed shaft and to cover the fixed shaft. The rotating shaft 37 is configured to be driven to rotate by a motor 36. In addition, a rotary resolver 49 and a fixed resolver 50 are provided for measuring the angular position between the fixed axis and the rotary axis. The rotation inspection table 12 is connected to a rotation shaft 37 and rotates with the rotation of the rotation shaft 37. A holder H can be placed on the rotation inspection table 12. The holder H is moved up and down and rotated by a holder elevating rotary shaft 48. The elevating operation of the holder elevating rotary shaft 48 is performed by a cam 46 and a cam follower 47 provided at the lower end of the holder elevating rotary shaft 48. The squeeze port side of the laminate tube T can be inserted into the holder H. A centering jig 38 for holding the tail side of the laminate tube T in a circular shape.
Are supported above the holder H. The in-tube inspection device 39 for inspecting the inside of the laminate tube T has an in-tube insertion section 40, a borescope 41, and a CCD camera 42. The borescope 41 includes a borescope main body 52 and a borescope insertion section 53. The insertion portion 40 in the tube is a borescope insertion portion 53.
Light emitting diode unit 54, photo sensor unit 55,
Contains. Of these, the borescope insertion section 53 mainly inspects the inner bottom side of the laminate tube T in the drawing, that is, the squeeze port side, and the light emitting diode section 54 and the photo sensor section 55 mainly inspect the inner side surface of the laminate tube T.

Next, the operation of the rotary tube inspection machine will be described with reference to FIGS. In FIG. 2, a laminate tube T is placed on a holder H and transported to a star wheel 11 by a transport conveyor 9 or the like. The star wheel 11 takes the laminated tube T together with the holder H onto the rotary inspection table 12 of the rotary tube inspection machine 2. After being taken on the rotating rotary inspection table 12, the holder H moves up and down according to the cam curve of the cam 46 as the holder elevating rotary shaft 48 moves up and down, and intermittently rotates around the axis of the holder elevating rotary shaft 48. I do.

That is, as shown in FIG.
Performs rotation at the inspection position while revolving in the 12 rotation directions
However, at that time, P₁, P_Two, P_Three, P_FourIn terms of
Stops the rotation for a predetermined time. Holder H rises
The laminate tube T also rises and the centering jig
Inside the tube inside the tube held circular by 38
The tube insertion section 40 of the inspection device 39 is inserted. this
As shown in FIG.
The laminated tube T is at point P₁~ P _FourBetween
In the tube by intermittent rotation
In this section using the inspection device 39,
The inner surface of the tube can be inspected. One chew
When the inspection of the probe is completed, the defective laminate tube
The tube T is discharged. The insertion section 40 in the tube is
Check the amount of light before inserting it into the
The light amount of the light emitting unit is checked by the power 51, and the result is
Reflected during data processing. If the light intensity is below the reference value,
In this case, an alarm can be issued to replace parts.

Next, a more detailed configuration of the insertion portion in the tube will be described with reference to FIGS. 9 and 10. FIG. FIG. 10 (A)
Shows a cross section in the II direction of the in-tube insertion portion 40 inserted in the laminate tube T. FIG. 10C is a cross-sectional view in the II-II direction, and FIG.
FIG. 3 is a cross-sectional view in the III-III direction.

The insertion section 40 in the tube is a borescope 4
1 includes a light emitting diode unit 54, a joint fitting 56 and a bolt 5;
7, the light emitting diode unit 54 and the photo sensors 55a, 55b, 55c, 55d, 55e, 5
5f is attached.

FIG. 10 is a sectional view of the borescope insertion portion 53.
It is shown in (B). The borescope insertion section 53 includes a lens section 60 for capturing an image inside a stainless steel tube 58, and a light source fiber section 59 including a thin glass fiber provided around the lens section 60. In FIG. 10D, the end face S of the borescope insertion section 53 is the borescope insertion section 5.
3 is perpendicular to the axis, but it may be cut obliquely at an angle to the axis. In this case, the field of view is expanded not only vertically downward but also obliquely.

The borescope insertion portion 53 is eccentric from the axis of the laminate tube T, and the positional relationship is shown in FIGS. 9A and 9C. That is, the inspection area F ₁ of the bore scope insertion portion 53 in this case is 4 minutes circular portion excluding the square of the camera field mask portion (hatched portion). Laminate tube T, the point P ₁ performs intermittently rotation motion as shown in FIG. 3,
Since the inspection is temporarily stopped at P ₂ , P ₃ , and P ₄ , the inspection area F ₁ in FIG. 9C can be inspected when the point P ₁ stops, and the inspection area F ₂ can be inspected when the point P ₂ stops. Can be inspected. Hereinafter, an inspection region F ₃ when it stops the point P ₃ in the same manner, the inspection area F ₄ when the stop point P _4, may be respectively examined. As described above, by dividing the inspection area as shown in FIGS. 9A and 9C and approaching the inner bottom surface to perform imaging and inspection,
As shown in FIGS. 9B and 9D, the resolution can be further improved and finer than when the borescope insertion portion 53 is inspected as one inspection area at the axis of the laminate tube T. Defects such as contaminants and scratches can be detected. The division of the inspection area is not limited to four divisions, and may be another number.

On the other hand, the light emitting diode unit 54
Cover from the inner bottom surface of the toe tube T to the upper opening surface
It has a length and can illuminate the inner surface from top to bottom.
Can be. Each of the photo sensors 55a to 55f has a light emitting device.
Three parts are provided on both sides of the iodine part 54.
The inspection areas overlap as shown in FIG.
It is provided as follows. With this configuration,
Photo sensors 55a to 55f and laminate tube T
During the period of rotation, that is, the point P in FIG. ₁,
P_Two, P_Three, P_FourDuring the period except for the period suspended at,
The inner surface can be inspected. Here is the photo
Sensors 55a-55f may be provided in a row,
Or, a photoelectric conversion element other than the photo sensor, for example, C
It may be a CD element or the like.

Next, the processing of the inspection information detected by the in-tube inspection device 39 will be described. The image information of the inner bottom surface of the laminate tube T detected by the CCD camera 42 is converted into a video signal, and the inspection information of the inner surface of the laminate tube T detected by the photo sensor unit 55 is converted into a voice signal, and both are mixed. Is transmitted to the outside to determine whether or not a defect is present.

FIG. 11 is a block diagram showing the flow of image information processing on the inner bottom surface of the laminate tube T. FIG.
Are roughly divided into a rotating block 85 and a fixed block 86. The rotation block 85 includes twelve CCD cameras 42a-
42l, a VIDEO selector 43 for dividing the 12 CCD cameras into four groups for each of the three cameras, selecting one of the three cameras, and selecting the image information.
a, 43b, 43c and 43d. The image information selected by the VIDEO selectors 43a, 43b, 43c, 43d is supplied to the RF converters 44a, 44b, 44c,
44d, and the information is converted into RF amplifiers 44e,
Amplified by 4f, 44g, 44h. The signals amplified by the RF amplifiers 44e, 44f, 44g, and 44h pass through BandPass Filters (bandpass filters) 44i, 44j, 44h, and 441, and thereafter, four VIDEO selectors 43a, 43b, and 43.
The signals selected from c and 43d are sent to a mixer 44 for mixing. The signal output from the mixer 44 is BP
It is sent to the antenna unit 45 through F95.

Referring to FIGS. 7A and 7B, the antenna unit 45 includes a fixed portion 110 and a rotating portion 111. The rotating part 111 includes a cylindrical part 111a and a disk part 111b.
And The fixing part 110 has grooves 110A, 110
B, 110C, and the fixed part 110 and the rotating part 111 are overlapped to form one antenna. The structure of the antenna in the groove 110A formed in the fixing portion 110 will be described as an example. In FIG. 5, a copper film 121 is formed on both sides of a printed board 120 made of a glass epoxy resin, and a circular shape is formed by etching. The thin band shape is referred to as an antenna side 121A, and the one covered with a copper coating over the entire surface is referred to as a ground side 121E. At this time, in order to match the impedances of the antennas on the transmitting side and the receiving side, a printed circuit board 1 formed on glass epoxy resin is used.
20, the width of the antenna section on the printed circuit board is 2.75 mm, the distance between the transmitting antenna AT and the receiving antenna RX is 1 mm, and the ground side 121E and the lead wires 81, 82 Is set to 1.6 mm, and these values are set to the same values as those of the transmitting antenna AT and the receiving antenna RX, so that the impedance becomes 50Ω from both the transmitting antenna AT and the receiving antenna RX, and the impedances are matched. (See FIG. 5B), and a signal free of noise without generation of a standing wave (SWR) can be transmitted and received.

As shown in FIG.
On the lower surface of A is a donut-shaped Teflon T having a thickness of 0.2 mm.
F is affixed. By interposing the Teflon TF between the two antennas 121A, even if the antennas are in contact with each other, it is possible to prevent generation of noise due to a short circuit, disturbance of an image, and destruction of a circuit due to impedance change. it can. The Teflon TF may be attached to both upper and lower antennas, or may be mounted on the lower antenna. The material other than Teflon is PTFE
(Fluorine resin), UHMW.PE (ultra high molecular weight polyethylene), POM (polyacetal), HMW.PE (high molecular weight polyethylene), etc., as long as they are excellent in insulation, lubricity and friction resistance. In addition, such a resin sheet has grooves 1
It goes without saying that the antennas provided in the 10B and 110C are also interposed.

FIG. 8 shows a schematic diagram of the transmitting antenna AT and the receiving antenna EX. As can be understood from this figure, the transmitting antenna AT and the receiving antenna EX have the antenna portions 121A, 121A in a stripe shape, and the ground portion 121E is entirely covered with a copper coating.

The sliding contact portion 13 made of carbon tool steel or the like
0 (see FIG. 7). Antenna section 121A
Are connected to an external unit by lead wires 81 and 82. The antenna unit 121A is a BNC connector 150
And signals are input and output through these lead wires 81 and 82.

As described above, in the grooves 110A, 110B, 110C formed in the fixed portion 110, each CCD as a pair of transmitting / receiving antennas for transmitting a synchronization signal is provided.
Used for camera. The transmitting antenna and the receiving antenna are in a non-contact state, always facing each other even if the rotating block rotates, and can transmit and receive information signals stably, and are electromagnetically shielded so that they are affected by external noise. And no noise source to the outside.

Here, the processing of the inspection information detected by the in-tuner inspection device 39 will be described. The image information of the inner bottom surface of the laminate tube T from each of the CCD cameras 42a to 42l is determined based on the angular position of the rotary inspection table 12 detected by the rotary resolver 49,
Is specified, image information is selected and taken from the camera, and transmitted to the mixer (mixer) 44. As apparent from FIG. 3, when in the laminate tube T has reached the point P ₄ is already the point P _3, the point P _2, since the subsequent laminated tubes T reaches to the point P _1, at the same time four cameras The image information from is acquired. The mixer 44 modulates and mixes these four pieces of image information with predetermined carrier waves, respectively. P. F. 95 to the transmitting antenna 46.

The signal output to the transmitting antenna 46 is sent to the groove 110A for accommodating the antenna section through the conducting wire 81, and is transmitted and received between the two antenna sections 121A. It is sent to the distributor 88 of the fixed block 86 described below.

The fixed block 86 comprises a distributor 88 for distributing the received image information to the four tuners, and the four RF converters 44a, 44b, 4
Tuners 89a, 89b, 89c, and 89d corresponding to the frequencies converted by the tuners 4c and 44d, and memory units 20a, 20b, 20c, and 20 for recording images reproduced by the four tuners 89a, 89b, 89c, and 89d.
d, 21a, 21b, 21c, 21d, and video image checkers 90A, 90B for processing image data stored in these memory units 20a to 20d, 21a to 21d into inspection data.

The mixed image information received by the antenna 46 is divided into frequency bands by a distributor 88 and sent to the tuners 89a to 89h to detect information signals.
Of the tuners 89a to 89d, tuners 89a and 8
The information signal from 9b is sent to the video image checker 90A. The information signals from tuners 89c and 89d are sent to video image checker 90B.

The image information is binarized by the video image checkers 90A and 90B. As a result, an OK signal is output if no foreign matter, scratch, dust, etc. is found, and an NG signal is output if they are found. 91 and the amplified signal becomes the judgment output. The determination of good or bad is made, for example, by binarizing the image information signal based on brightness and determining the number of pixels in the dark area.

On the other hand, the video image checker 90A,
From 90B, horizontal and vertical synchronizing signals for synchronizing the CCD camera 42 are supplied to amplifiers 92a to 92d and 93, respectively.
These are sent to the mixers 94a and 94b through a to 93d.
Each of the mixers 94a and 94b modulates the carrier into a predetermined carrier, and sends the modulated carrier to the groove of the fixed portion of the antenna unit 46.
Then, the carrier is received by the rotating part of the antenna unit 46 and distributed to signals corresponding to the horizontal and vertical synchronization signals by distributors 95a and 95b, respectively.
6d, CCD camera 4 via buffers 97a, 97b
Sent to 2.

In the above embodiment, the transmission antenna and the reception antenna, which are ring-shaped conductors, have been described as being ring-shaped. However, they may be ring-shaped, disk-shaped, or linear, and may be radially overlapping. The shape may be a double ring. This is because the action and effect do not change.

Although only one antenna structure has been described, a plurality of antennas may be formed.

[0034]

As described above, according to the present invention,
Provided is a signal transmission device capable of transmitting and receiving signals between a rotating unit and a fixed unit in a non-contact manner, and performing signal transmission with no external noise and without being a noise source to the outside. be able to.

Further, even if the transmitting antenna and the receiving antenna are in contact with each other, the electrical characteristics of the insulating sheet are ensured.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of a rotary tube inspection machine to which the signal transmission device of the present invention is applied.

FIG. 3 is an operation explanatory view of the rotary tube inspection machine.

FIG. 4 is a configuration diagram of the rotary tube inspection machine.

FIG. 5 is a sectional view and an equivalent circuit diagram of an antenna unit in the embodiment.

FIG. 6 is a main part configuration diagram of the antenna unit.

FIG. 7 is a configuration diagram of the antenna unit.

FIG. 8 is a perspective view of the antenna unit.

FIG. 9 is a view for explaining the field of view of the camera of the insertion portion in the tube in the embodiment.

FIG. 10 is a cross-sectional view of each part of the insertion portion in the tube.

FIG. 11 is a block diagram of the rotary tube inspection machine.

[Explanation of symbols]

 45 Antenna part 49 Rotating resolver 110 Fixed part 110A to 110C Groove 111 Rotating part 121 Coating 121A Antenna surface 130 Sliding part TF Teflon (insulating sheet)

Claims (3)

(57) [Claims] 1. A metal disk is formed on both sides of a resin disk,
A signal transmission device in which one surface is grounded, the other surface is an antenna surface, and the antenna surfaces face each other to transmit and receive signals. 2. The signal transmission device according to claim 1, wherein the metal film is a copper film, and the disk is a glass epoxy resin. 3. The signal transmission device according to claim 1, wherein an insulating sheet is provided between the facing antenna surfaces.